drivers/ide/pci/via82cxxx.c

   1 /*
   2  *
   3  * Version 3.40
   4  *
   5  * VIA IDE driver for Linux. Supported southbridges:
   6  *
   7  *   vt82c576, vt82c586, vt82c586a, vt82c586b, vt82c596a, vt82c596b,
   8  *   vt82c686, vt82c686a, vt82c686b, vt8231, vt8233, vt8233c, vt8233a,
   9  *   vt8235, vt8237, vt8237a
  10  *
  11  * Copyright (c) 2000-2002 Vojtech Pavlik
  12  * Copyright (c) 2007 Bartlomiej Zolnierkiewicz
  13  *
  14  * Based on the work of:
  15  *      Michel Aubry
  16  *      Jeff Garzik
  17  *      Andre Hedrick
  18  *
  19  * Documentation:
  20  *      Obsolete device documentation publically available from via.com.tw
  21  *      Current device documentation available under NDA only
  22  */
  23
  24 /*
  25  * This program is free software; you can redistribute it and/or modify it
  26  * under the terms of the GNU General Public License version 2 as published by
  27  * the Free Software Foundation.
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/ioport.h>
  33 #include <linux/blkdev.h>
  34 #include <linux/pci.h>
  35 #include <linux/init.h>
  36 #include <linux/ide.h>
  37 #include <asm/io.h>
  38
  39 #ifdef CONFIG_PPC_CHRP
  40 #include <asm/processor.h>
  41 #endif
  42
  43 #include "ide-timing.h"
  44
  45 #define VIA_IDE_ENABLE          0x40
  46 #define VIA_IDE_CONFIG          0x41
  47 #define VIA_FIFO_CONFIG         0x43
  48 #define VIA_MISC_1              0x44
  49 #define VIA_MISC_2              0x45
  50 #define VIA_MISC_3              0x46
  51 #define VIA_DRIVE_TIMING        0x48
  52 #define VIA_8BIT_TIMING         0x4e
  53 #define VIA_ADDRESS_SETUP       0x4c
  54 #define VIA_UDMA_TIMING         0x50
  55
  56 #define VIA_BAD_PREQ            0x01 /* Crashes if PREQ# till DDACK# set */
  57 #define VIA_BAD_CLK66           0x02 /* 66 MHz clock doesn't work correctly */
  58 #define VIA_SET_FIFO            0x04 /* Needs to have FIFO split set */
  59 #define VIA_NO_UNMASK           0x08 /* Doesn't work with IRQ unmasking on */
  60 #define VIA_BAD_ID              0x10 /* Has wrong vendor ID (0x1107) */
  61 #define VIA_BAD_AST             0x20 /* Don't touch Address Setup Timing */
  62
  63 /*
  64  * VIA SouthBridge chips.
  65  */
  66
  67 static struct via_isa_bridge {
  68         char *name;
  69         u16 id;
  70         u8 rev_min;
  71         u8 rev_max;
  72         u8 udma_mask;
  73         u8 flags;
  74 } via_isa_bridges[] = {
  75         { "cx700",      PCI_DEVICE_ID_VIA_CX700,    0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
  76         { "vt8237s",    PCI_DEVICE_ID_VIA_8237S,    0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
  77         { "vt6410",     PCI_DEVICE_ID_VIA_6410,     0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
  78         { "vt8251",     PCI_DEVICE_ID_VIA_8251,     0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
  79         { "vt8237",     PCI_DEVICE_ID_VIA_8237,     0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
  80         { "vt8237a",    PCI_DEVICE_ID_VIA_8237A,    0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
  81         { "vt8235",     PCI_DEVICE_ID_VIA_8235,     0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
  82         { "vt8233a",    PCI_DEVICE_ID_VIA_8233A,    0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
  83         { "vt8233c",    PCI_DEVICE_ID_VIA_8233C_0,  0x00, 0x2f, ATA_UDMA5, },
  84         { "vt8233",     PCI_DEVICE_ID_VIA_8233_0,   0x00, 0x2f, ATA_UDMA5, },
  85         { "vt8231",     PCI_DEVICE_ID_VIA_8231,     0x00, 0x2f, ATA_UDMA5, },
  86         { "vt82c686b",  PCI_DEVICE_ID_VIA_82C686,   0x40, 0x4f, ATA_UDMA5, },
  87         { "vt82c686a",  PCI_DEVICE_ID_VIA_82C686,   0x10, 0x2f, ATA_UDMA4, },
  88         { "vt82c686",   PCI_DEVICE_ID_VIA_82C686,   0x00, 0x0f, ATA_UDMA2, VIA_BAD_CLK66 },
  89         { "vt82c596b",  PCI_DEVICE_ID_VIA_82C596,   0x10, 0x2f, ATA_UDMA4, },
  90         { "vt82c596a",  PCI_DEVICE_ID_VIA_82C596,   0x00, 0x0f, ATA_UDMA2, VIA_BAD_CLK66 },
  91         { "vt82c586b",  PCI_DEVICE_ID_VIA_82C586_0, 0x47, 0x4f, ATA_UDMA2, VIA_SET_FIFO },
  92         { "vt82c586b",  PCI_DEVICE_ID_VIA_82C586_0, 0x40, 0x46, ATA_UDMA2, VIA_SET_FIFO | VIA_BAD_PREQ },
  93         { "vt82c586b",  PCI_DEVICE_ID_VIA_82C586_0, 0x30, 0x3f, ATA_UDMA2, VIA_SET_FIFO },
  94         { "vt82c586a",  PCI_DEVICE_ID_VIA_82C586_0, 0x20, 0x2f, ATA_UDMA2, VIA_SET_FIFO },
  95         { "vt82c586",   PCI_DEVICE_ID_VIA_82C586_0, 0x00, 0x0f,      0x00, VIA_SET_FIFO },
  96         { "vt82c576",   PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f,      0x00, VIA_SET_FIFO | VIA_NO_UNMASK },
  97         { "vt82c576",   PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f,      0x00, VIA_SET_FIFO | VIA_NO_UNMASK | VIA_BAD_ID },
  98         { NULL }
  99 };
 100
 101 static unsigned int via_clock;
 102 static char *via_dma[] = { "16", "25", "33", "44", "66", "100", "133" };
 103
 104 struct via82cxxx_dev
 105 {
 106         struct via_isa_bridge *via_config;
 107         unsigned int via_80w;
 108 };
 109
 110 /**
 111  *      via_set_speed                   -       write timing registers
 112  *      @dev: PCI device
 113  *      @dn: device
 114  *      @timing: IDE timing data to use
 115  *
 116  *      via_set_speed writes timing values to the chipset registers
 117  */
 118
 119 static void via_set_speed(ide_hwif_t *hwif, u8 dn, struct ide_timing *timing)
 120 {
 121         struct pci_dev *dev = hwif->pci_dev;
 122         struct via82cxxx_dev *vdev = pci_get_drvdata(hwif->pci_dev);
 123         u8 t;
 124
 125         if (~vdev->via_config->flags & VIA_BAD_AST) {
 126                 pci_read_config_byte(dev, VIA_ADDRESS_SETUP, &t);
 127                 t = (t & ~(3 << ((3 - dn) << 1))) | ((FIT(timing->setup, 1, 4) - 1) << ((3 - dn) << 1));
 128                 pci_write_config_byte(dev, VIA_ADDRESS_SETUP, t);
 129         }
 130
 131         pci_write_config_byte(dev, VIA_8BIT_TIMING + (1 - (dn >> 1)),
 132                 ((FIT(timing->act8b, 1, 16) - 1) << 4) | (FIT(timing->rec8b, 1, 16) - 1));
 133
 134         pci_write_config_byte(dev, VIA_DRIVE_TIMING + (3 - dn),
 135                 ((FIT(timing->active, 1, 16) - 1) << 4) | (FIT(timing->recover, 1, 16) - 1));
 136
 137         switch (vdev->via_config->udma_mask) {
 138         case ATA_UDMA2: t = timing->udma ? (0xe0 | (FIT(timing->udma, 2, 5) - 2)) : 0x03; break;
 139         case ATA_UDMA4: t = timing->udma ? (0xe8 | (FIT(timing->udma, 2, 9) - 2)) : 0x0f; break;
 140         case ATA_UDMA5: t = timing->udma ? (0xe0 | (FIT(timing->udma, 2, 9) - 2)) : 0x07; break;
 141         case ATA_UDMA6: t = timing->udma ? (0xe0 | (FIT(timing->udma, 2, 9) - 2)) : 0x07; break;
 142         default: return;
 143         }
 144
 145         pci_write_config_byte(dev, VIA_UDMA_TIMING + (3 - dn), t);
 146 }
 147
 148 /**
 149  *      via_set_drive           -       configure transfer mode
 150  *      @drive: Drive to set up
 151  *      @speed: desired speed
 152  *
 153  *      via_set_drive() computes timing values configures the drive and
 154  *      the chipset to a desired transfer mode. It also can be called
 155  *      by upper layers.
 156  */
 157
 158 static int via_set_drive(ide_drive_t *drive, u8 speed)
 159 {
 160         ide_drive_t *peer = HWIF(drive)->drives + (~drive->dn & 1);
 161         struct via82cxxx_dev *vdev = pci_get_drvdata(drive->hwif->pci_dev);
 162         struct ide_timing t, p;
 163         unsigned int T, UT;
 164
 165         if (speed != XFER_PIO_SLOW)
 166                 ide_config_drive_speed(drive, speed);
 167
 168         T = 1000000000 / via_clock;
 169
 170         switch (vdev->via_config->udma_mask) {
 171         case ATA_UDMA2: UT = T;   break;
 172         case ATA_UDMA4: UT = T/2; break;
 173         case ATA_UDMA5: UT = T/3; break;
 174         case ATA_UDMA6: UT = T/4; break;
 175         default:        UT = T;
 176         }
 177
 178         ide_timing_compute(drive, speed, &t, T, UT);
 179
 180         if (peer->present) {
 181                 ide_timing_compute(peer, peer->current_speed, &p, T, UT);
 182                 ide_timing_merge(&p, &t, &t, IDE_TIMING_8BIT);
 183         }
 184
 185         via_set_speed(HWIF(drive), drive->dn, &t);
 186
 187         if (!drive->init_speed)
 188                 drive->init_speed = speed;
 189         drive->current_speed = speed;
 190
 191         return 0;
 192 }
 193
 194 /**
 195  *      via82cxxx_tune_drive    -       PIO setup
 196  *      @drive: drive to set up
 197  *      @pio: mode to use (255 for 'best possible')
 198  *
 199  *      A callback from the upper layers for PIO-only tuning.
 200  */
 201
 202 static void via82cxxx_tune_drive(ide_drive_t *drive, u8 pio)
 203 {
 204         if (pio == 255) {
 205                 via_set_drive(drive, ide_find_best_pio_mode(drive));
 206                 return;
 207         }
 208
 209         via_set_drive(drive, XFER_PIO_0 + min_t(u8, pio, 5));
 210 }
 211
 212 /**
 213  *      via82cxxx_ide_dma_check         -       set up for DMA if possible
 214  *      @drive: IDE drive to set up
 215  *
 216  *      Set up the drive for the highest supported speed considering the
 217  *      driver, controller and cable
 218  */
 219
 220 static int via82cxxx_ide_dma_check (ide_drive_t *drive)
 221 {
 222         u8 speed = ide_max_dma_mode(drive);
 223
 224         if (speed == 0)
 225                 speed = ide_find_best_pio_mode(drive);
 226
 227         via_set_drive(drive, speed);
 228
 229         if (drive->autodma && (speed & XFER_MODE) != XFER_PIO)
 230                 return 0;
 231
 232         return -1;
 233 }
 234
 235 static struct via_isa_bridge *via_config_find(struct pci_dev **isa)
 236 {
 237         struct via_isa_bridge *via_config;
 238         u8 t;
 239
 240         for (via_config = via_isa_bridges; via_config->id; via_config++)
 241                 if ((*isa = pci_get_device(PCI_VENDOR_ID_VIA +
 242                         !!(via_config->flags & VIA_BAD_ID),
 243                         via_config->id, NULL))) {
 244
 245                         pci_read_config_byte(*isa, PCI_REVISION_ID, &t);
 246                         if (t >= via_config->rev_min &&
 247                             t <= via_config->rev_max)
 248                                 break;
 249                         pci_dev_put(*isa);
 250                 }
 251
 252         return via_config;
 253 }
 254
 255 /*
 256  * Check and handle 80-wire cable presence
 257  */
 258 static void __devinit via_cable_detect(struct via82cxxx_dev *vdev, u32 u)
 259 {
 260         int i;
 261
 262         switch (vdev->via_config->udma_mask) {
 263                 case ATA_UDMA4:
 264                         for (i = 24; i >= 0; i -= 8)
 265                                 if (((u >> (i & 16)) & 8) &&
 266                                     ((u >> i) & 0x20) &&
 267                                      (((u >> i) & 7) < 2)) {
 268                                         /*
 269                                          * 2x PCI clock and
 270                                          * UDMA w/ < 3T/cycle
 271                                          */
 272                                         vdev->via_80w |= (1 << (1 - (i >> 4)));
 273                                 }
 274                         break;
 275
 276                 case ATA_UDMA5:
 277                         for (i = 24; i >= 0; i -= 8)
 278                                 if (((u >> i) & 0x10) ||
 279                                     (((u >> i) & 0x20) &&
 280                                      (((u >> i) & 7) < 4))) {
 281                                         /* BIOS 80-wire bit or
 282                                          * UDMA w/ < 60ns/cycle
 283                                          */
 284                                         vdev->via_80w |= (1 << (1 - (i >> 4)));
 285                                 }
 286                         break;
 287
 288                 case ATA_UDMA6:
 289                         for (i = 24; i >= 0; i -= 8)
 290                                 if (((u >> i) & 0x10) ||
 291                                     (((u >> i) & 0x20) &&
 292                                      (((u >> i) & 7) < 6))) {
 293                                         /* BIOS 80-wire bit or
 294                                          * UDMA w/ < 60ns/cycle
 295                                          */
 296                                         vdev->via_80w |= (1 << (1 - (i >> 4)));
 297                                 }
 298                         break;
 299         }
 300 }
 301
 302 /**
 303  *      init_chipset_via82cxxx  -       initialization handler
 304  *      @dev: PCI device
 305  *      @name: Name of interface
 306  *
 307  *      The initialization callback. Here we determine the IDE chip type
 308  *      and initialize its drive independent registers.
 309  */
 310
 311 static unsigned int __devinit init_chipset_via82cxxx(struct pci_dev *dev, const char *name)
 312 {
 313         struct pci_dev *isa = NULL;
 314         struct via82cxxx_dev *vdev;
 315         struct via_isa_bridge *via_config;
 316         u8 t, v;
 317         u32 u;
 318
 319         vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
 320         if (!vdev) {
 321                 printk(KERN_ERR "VP_IDE: out of memory :(\n");
 322                 return -ENOMEM;
 323         }
 324         pci_set_drvdata(dev, vdev);
 325
 326         /*
 327          * Find the ISA bridge to see how good the IDE is.
 328          */
 329         vdev->via_config = via_config = via_config_find(&isa);
 330
 331         /* We checked this earlier so if it fails here deeep badness
 332            is involved */
 333
 334         BUG_ON(!via_config->id);
 335
 336         /*
 337          * Detect cable and configure Clk66
 338          */
 339         pci_read_config_dword(dev, VIA_UDMA_TIMING, &u);
 340
 341         via_cable_detect(vdev, u);
 342
 343         if (via_config->udma_mask == ATA_UDMA4) {
 344                 /* Enable Clk66 */
 345                 pci_write_config_dword(dev, VIA_UDMA_TIMING, u|0x80008);
 346         } else if (via_config->flags & VIA_BAD_CLK66) {
 347                 /* Would cause trouble on 596a and 686 */
 348                 pci_write_config_dword(dev, VIA_UDMA_TIMING, u & ~0x80008);
 349         }
 350
 351         /*
 352          * Check whether interfaces are enabled.
 353          */
 354
 355         pci_read_config_byte(dev, VIA_IDE_ENABLE, &v);
 356
 357         /*
 358          * Set up FIFO sizes and thresholds.
 359          */
 360
 361         pci_read_config_byte(dev, VIA_FIFO_CONFIG, &t);
 362
 363         /* Disable PREQ# till DDACK# */
 364         if (via_config->flags & VIA_BAD_PREQ) {
 365                 /* Would crash on 586b rev 41 */
 366                 t &= 0x7f;
 367         }
 368
 369         /* Fix FIFO split between channels */
 370         if (via_config->flags & VIA_SET_FIFO) {
 371                 t &= (t & 0x9f);
 372                 switch (v & 3) {
 373                         case 2: t |= 0x00; break;       /* 16 on primary */
 374                         case 1: t |= 0x60; break;       /* 16 on secondary */
 375                         case 3: t |= 0x20; break;       /* 8 pri 8 sec */
 376                 }
 377         }
 378
 379         pci_write_config_byte(dev, VIA_FIFO_CONFIG, t);
 380
 381         /*
 382          * Determine system bus clock.
 383          */
 384
 385         via_clock = system_bus_clock() * 1000;
 386
 387         switch (via_clock) {
 388                 case 33000: via_clock = 33333; break;
 389                 case 37000: via_clock = 37500; break;
 390                 case 41000: via_clock = 41666; break;
 391         }
 392
 393         if (via_clock < 20000 || via_clock > 50000) {
 394                 printk(KERN_WARNING "VP_IDE: User given PCI clock speed "
 395                         "impossible (%d), using 33 MHz instead.\n", via_clock);
 396                 printk(KERN_WARNING "VP_IDE: Use ide0=ata66 if you want "
 397                         "to assume 80-wire cable.\n");
 398                 via_clock = 33333;
 399         }
 400
 401         /*
 402          * Print the boot message.
 403          */
 404
 405         pci_read_config_byte(isa, PCI_REVISION_ID, &t);
 406         printk(KERN_INFO "VP_IDE: VIA %s (rev %02x) IDE %sDMA%s "
 407                 "controller on pci%s\n",
 408                 via_config->name, t,
 409                 via_config->udma_mask ? "U" : "MW",
 410                 via_dma[via_config->udma_mask ?
 411                         (fls(via_config->udma_mask) - 1) : 0],
 412                 pci_name(dev));
 413
 414         pci_dev_put(isa);
 415         return 0;
 416 }
 417
 418 static void __devinit init_hwif_via82cxxx(ide_hwif_t *hwif)
 419 {
 420         struct via82cxxx_dev *vdev = pci_get_drvdata(hwif->pci_dev);
 421         int i;
 422
 423         hwif->autodma = 0;
 424
 425         hwif->tuneproc = &via82cxxx_tune_drive;
 426         hwif->speedproc = &via_set_drive;
 427
 428
 429 #ifdef CONFIG_PPC_CHRP
 430         if(machine_is(chrp) && _chrp_type == _CHRP_Pegasos) {
 431                 hwif->irq = hwif->channel ? 15 : 14;
 432         }
 433 #endif
 434
 435         for (i = 0; i < 2; i++) {
 436                 hwif->drives[i].io_32bit = 1;
 437                 hwif->drives[i].unmask = (vdev->via_config->flags & VIA_NO_UNMASK) ? 0 : 1;
 438                 hwif->drives[i].autotune = 1;
 439                 hwif->drives[i].dn = hwif->channel * 2 + i;
 440         }
 441
 442         if (!hwif->dma_base)
 443                 return;
 444
 445         hwif->atapi_dma = 1;
 446
 447         hwif->ultra_mask = vdev->via_config->udma_mask;
 448         hwif->mwdma_mask = 0x07;
 449         hwif->swdma_mask = 0x07;
 450
 451         if (!hwif->udma_four)
 452                 hwif->udma_four = (vdev->via_80w >> hwif->channel) & 1;
 453         hwif->ide_dma_check = &via82cxxx_ide_dma_check;
 454         if (!noautodma)
 455                 hwif->autodma = 1;
 456         hwif->drives[0].autodma = hwif->autodma;
 457         hwif->drives[1].autodma = hwif->autodma;
 458 }
 459
 460 static ide_pci_device_t via82cxxx_chipsets[] __devinitdata = {
 461         {       /* 0 */
 462                 .name           = "VP_IDE",
 463                 .init_chipset   = init_chipset_via82cxxx,
 464                 .init_hwif      = init_hwif_via82cxxx,
 465                 .channels       = 2,
 466                 .autodma        = NOAUTODMA,
 467                 .enablebits     = {{0x40,0x02,0x02}, {0x40,0x01,0x01}},
 468                 .bootable       = ON_BOARD
 469         },{     /* 1 */
 470                 .name           = "VP_IDE",
 471                 .init_chipset   = init_chipset_via82cxxx,
 472                 .init_hwif      = init_hwif_via82cxxx,
 473                 .channels       = 2,
 474                 .autodma        = AUTODMA,
 475                 .enablebits     = {{0x00,0x00,0x00}, {0x00,0x00,0x00}},
 476                 .bootable       = ON_BOARD,
 477         }
 478 };
 479
 480 static int __devinit via_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 481 {
 482         struct pci_dev *isa = NULL;
 483         struct via_isa_bridge *via_config;
 484         /*
 485          * Find the ISA bridge and check we know what it is.
 486          */
 487         via_config = via_config_find(&isa);
 488         pci_dev_put(isa);
 489         if (!via_config->id) {
 490                 printk(KERN_WARNING "VP_IDE: Unknown VIA SouthBridge, disabling DMA.\n");
 491                 return -ENODEV;
 492         }
 493         return ide_setup_pci_device(dev, &via82cxxx_chipsets[id->driver_data]);
 494 }
 495
 496 static struct pci_device_id via_pci_tbl[] = {
 497         { PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C576_1, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 498         { PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_1, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 499         { PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_6410,     PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1},
 500         { PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_SATA_EIDE,     PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1},
 501         { 0, },
 502 };
 503 MODULE_DEVICE_TABLE(pci, via_pci_tbl);
 504
 505 static struct pci_driver driver = {
 506         .name           = "VIA_IDE",
 507         .id_table       = via_pci_tbl,
 508         .probe          = via_init_one,
 509 };
 510
 511 static int __init via_ide_init(void)
 512 {
 513         return ide_pci_register_driver(&driver);
 514 }
 515
 516 module_init(via_ide_init);
 517
 518 MODULE_AUTHOR("Vojtech Pavlik, Michel Aubry, Jeff Garzik, Andre Hedrick");
 519 MODULE_DESCRIPTION("PCI driver module for VIA IDE");
 520 MODULE_LICENSE("GPL");